Two important issues need to be addressed when using lattice Boltzmann
methods to simulate particulate flows: complex moving boundaries and
near contact of two solid objects. This study introduces a new boundary
treatment method for using lattice Boltzmann methods to study fluid-
particle interaction problems in which solid objects are close to a wall
or two solid objects are near contact. The new method does not need to
use any additional lubrication correction to total hydrodynamic force,
instead implementing the no-slip boundary condition by introducing an
appropriate fictitious flow field outside the fluid domain. The new
method was verified by simulating a spherical particle falling down in
fluids with and without rebound. It is concluded that the proposed
boundary treatment method can accurately simulate the fluid-particle
interaction near a rigid wall and collision in fluid.